Electrically-heated device



Aug. 14. 1928. 1,680,748

J. L. SHROYER ELECTRICALLY HEATED DEVICE Filed Sept. 28, 1925 Invento'v; Jacob L Snnoger, by m if His Attorney.

Patented Aug. 14, 1928.

,UNITEDxsTA-Tes PATENT orifice.

JACOB L. SHROYER, OF-OAIPARK,"1IL1NOIS,ASSIGNOR'TOEDISON ELECTRIC AP- PLIANCE COMPANY, INCORPORATEDfOF CHICAGO, ILLINOIS ,A CORPORATION OF NEW Yom;

ELECTRICALLY-HEATED DEIICE.-

.Application mea september 28, 1925.ser1a1' No. 58.972.V l

My invention 'relates to electrically heated devices and has for4 its object .thegprovision of an electrically heated.: device? of simple, rugged and inexpensiveconstruction.

More.speciicallyimy invention relates to electrically heated appliances,y such, 'as.,elec tric flatirons,'hotplates, waile irons, 'and the like.' It has'heretoforebeenl proposed inthe construction of `iiatirons, .and other electrically heated devices, to-cast Vthe electric heatingunit in the body .of the device. This forms an inexpensive vand ruggedconstruction and has the further advantage that the heating unit is brought into intimate thermal relation with the surrounding metal. With former constructions, however, it has been necessary yupon .failure lof the heating unit tofthrow away a relatively costly part of the devicealong with the'defective heatingunitf `,:r

In accordance with my invention I obtain the advantages 'off' a cast-in heating unit, while.at the' same time -I -provideor renewal of the heatingiunit 'at' low cost as compared with'theztotal cost of .the device.` In

carrying :out my'inventon I vcast the electric heatingjumt in a separate part whlch is clamped to the heated body and maybe easilyv removed for renewal.V I

For a more complete understanding of my invention reference should be'had to .the accompanying drawing in which Fig. 1 is a sectional view of an electric atiron embodying my invention, while. Fig. .2 is a plan view partially insection ofV the fiatiron shown in Fig. 1, the cover and handle being removed.

Referring to the drawing, I have shown my invention iny one form as applied to anelectrically heated flatiron comprising a metallic body member 10 of suitable conformation, the lower side of .which is provided.

with an ironing surface. Thisbody member 10 is also sometimes known asa sole plate. The body member '10 is heated byl means of a resistance heating unit 11 which is cast in a separate metal plate or member 12, sometimes knownas a pressure plate. As shown the member 12 has subtantially the same shape as the body member 10, but is somewhat smaller. It is clamped securely by means of screws 13 to the upper surface of the bod member 10 in good heat co1i ducting re ation therewith.

- he heating.

r v nit lljisprefelfably offfthe sheathed wire type., As shown it consists of an outer vmetallic sheath 14 in which a helical resistance `conductor 15 fis embedded in compacted powdered insulating material 16. `Such :a heating `unit i sdescribed and claimedin Patent No.-1,367,341.toAbbott Adated February 1,1921. ,Theheating unit iis substantially horseshoe shaped and ex'- .tends substantially parallel with the sides of the body member 10, vIts ends roject fromythemember 12 atthe heel of ;t e flatiron and are provided .with suitable terminals 17 and 18 whichI are electrically 4con- .nected to the resistanceconductor V15 but insulated from `the sheath 1,4 and other ad? jacent parts. The member 12, as shown, is somewhat .shortenpthanethe body member 10 in order .to Eprovide spacefor the terminals at the heel of vbody member 10. i

1 The member-12 has substantiallygthefsame lgeneral .shape as the .heating unit and. provides an outer zone of thick metal tin which the heating .untfis cast. JIt-"is provided with a central aperture ,19, and the heavy portion in .which the ,heating unit lis .cast

may fbey considereclgas4 being Isnbstz'mtially vhorseshoe shaped.Vv with its lends connected mechanlcally by an integral bar 20. Around the aperture y19 `are recesses to receive thev clamping. screws 13, three of theselrecesses 21, 22 and .23 being shown. These recesses, which take the place of holes for the screws 13, are formed. upon the `casting of the vmember 12. .The contacting surfaces y of the member .12. and the body member 10 are finished offl smooth so as 'te fit each other ,and permit heat to be conducted freely from the plate 12 to .the body member 10..l

A central ledge orraisedv` portion,26 is vprovided on the upper surface of the member 10, and it is on this raised portion that the plate, 12 is clamped.. A cover 27 made of sheet metal lits over the plate 12 and this raised .portion 26, and rests on the member v10. The cover is held in position by means of lugs 28-32 inclusive, Aextending laterally from the raised portion 26. It is secured to the member 10 by means of clamping screws 33 and 34. These screws likewise pass through and secure a support 35 for the Hatiron handle 36. A pair of contact pins 37 (only one of which is shown) are secured to the cover 27 and electrically con:

nected. to the '.terminals "17 andj'18' respectively whereby the heating unit 11 may be connected to a suit-able electrical source of su p piv by means of. an, attachmentinhlg operating with the..y pins 37. The terminal pins are surrounded by a -plug guard 38.

The particular arrangementils'hawaii-Hof?thenV contact pins and plugv guard is described and claimed in Patent No."1",539,605 to Simmonsdated May' 26, 1925..

Vi th this arrangement' Avwill be ,observed 'thatthc heating unit 11 is-in' intimate thermal relation `with the metal o'fthemember 12 surrounding it since it is'c'astin themember 12, so-that heat is conducted freely from the heating junit to--theiadjcentpartspf the member 12'and,t he body 1Q. The device alec has lthe advantage o 'f-havilng"very few parts and these'par'tsare very simple' and 'rugged *intconstruction? In' case Vof"fai l'ure o fthe lheating unit, which is, practicallyA the only part which is subject to appreciable deteriorationin use, 'the' vme'mber"1 2 and the h et.- infnr unit may be removed and a new part substituted. This, permitsv the 'continued 'use ofthe device.

While '.Ihavades'cribed' my invention as embodied inconcrete 'form and as, operating in a. specificfmanne'r lin accordance witlrtl'ie jrovisi'ons of the 'patent statutes, it' should of the remaining and more expensive parts e ,understood 'that ldo' noty limi-t' my invention thereto,v since L"varieus' modications thereofv vvillsuggest 'themselves "to those skilled in vthe art lwithoitdeparting from the-spirit ofmy invention, :the scope of which 'is set forth in' theannexed claims.

That Ijclaim as nev;7 and'desireto secure by Lean-S Patent oflshefnnitedsates', is.;

1; In `an electricallyuheated device, ,thej combination with a meniber, to be heated, 'of an insulated electric heatingunit, a second f metallic member in which said heating unit is cast so as-to provide a'zone Qfiheavy-n'ietal i surroundingr said-11nd,v and means for clampingr said second vmemberto thejirst in goodl heat conductingl relation therewith.`

2. In an Aelectrically heateddevice, the

combination'ivith a member-to-be heated, of=

a second lmember made oficast metal, an electrie heatingv unit vcastvin said secondmember, and means for removably clamping said second mcn'iber on said"rst`meniber^1n goodthermal relation therewith so that'sa-id second member and said heating `unit may be removed as a unit to vprovide, 'for renewal-of said heatingfunit,

ele'ctijic 'appliance comprising a l member zto-i beheated, a. cast' meta-1 -member fitting on-said-first member in `oodthermal relation therewith, means for removably claanpinglsecond menmr, on said. first member, a sheatheddieating, unit cast in said second member. i l

-jk.;Anielectric atiron comprising a sole plate, a pressure plate made of cast metal,

Aal'ifinslilated resistanceconductor cast in said pressure plate, and means for clamping said pressure plate-onI said s'ole'platef 1in lintimatc thermal; relation there/With. '1'

' An electric Hatron comprising a sole plate, an encased'heating unit liavin-giisuh 'stantilly ithe same shape as said sole lp'late, ayr'net'alli'c meinberliniwhich said 'unit vis cast 'providingl a' izonefo'fv thiokimetal :surrounding said 1mit,"a'nd-jmeans for securingssaid mein- `b'er to saifd=s0lelplatefin :gOod heat-conductiimli-elation therewith'.

" 6. Angelectric flatiron conipri'inga met-al sole plate, fia'. pressure plate. madef ofafca'st metal," sheathed wire :heating-:unit cast;- in said pressure plate, meansfor cla-mpinnfr said pressnreiplate-on said sole plate,a cover fitting over Said'pressurep-late.resting `0n saidi sole plates, `means orsecuring--said cover, and ahandle secured Eto said cover.=

v'7l An` electric fiatironncomprisingv-as sole plate, a sheathed electric heatingfunitf ex- Ytel'fidirgearoundfithe edge fofrsaidrplate, a

metallic-2 member-in which .-theunit .l -is cast 'providing aE zpne -lof relatively.- thiclc.y metal 'surrounding -said Lunit, saidi Imember being provided wi=tih ancentrail saperture', .andmeans for clamping said'uhember-.on said sole.plate. 81l Anf electric iatiron comprising; -iai sole platee4 a renewable 'cast-inl electric. heating unit thereforcomprising;r a horseshoe-shaped heatmnnltiwa' horseshoe-sha ed; )ressurc 1 i,

platecasbaround fsaid 'heatingfuintand 'pro- '\'idingla.zone ofv heavy.. metalsurrounding my. h'and :this =2tzday of- September, 1925. Jason-L. SHRQYER. 

